Honestly, I was rather a fan of the mention of fuses. Make grades of fuse based on voltage tiers, screw up your power, the fuse blows instead of the machine, assuming you've installed one.
So if you blow an HV fuse, maybe you lose a few diamonds and have to replace it.
It's a good balance between a punishment mechanic and the reality that people don't like to leave large craters in their base.
Would there be a functional difference between making fuses, and making cables blow before machines (if they don't do that already)? Cables just vaporize, without affecting other blocks, which sounds a lot like a fuse.